Chemistry questions
29404 published questions with worked solutions.
- A(g) 2B(g) + C(g) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600...
- Sea water contains 29.25% NaCl and 19% MgCl_2 by weight of solution. The normal boiling point of the sea water is _______°C...
- Match the following Column-A: A. Nylon 6 B. Vulcanized Rubber C. cis-1, 4-polyisoprene D. Polychloroprene Column-B: I. Natural...Not in JEE Main or NEET syllabus
- The mismatched combinations are A. Chlorophyll – Co B. Water hardness – EDTA C. Photography – [Ag(CN)_2]^- D. Wilkinson catalyst...
- In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?
- ClF_5 at room temperature is a
- D-(+)-Glyceraldehyde [ (iii) HNO_3] (i) HCN (ii) H_2O/H^+ The products formed in the above reaction are
- Be(OH)_2 reacts with Sr(OH)_2 to yield an ionic salt. Choose the incorrect option related to this reaction from the followingNot in JEE Main or NEET syllabus
- What happens when a lyophilic sol is added to a lyophobic sol?Not in JEE Main or NEET syllabus
- The energy of an electron in the first Bohr orbit of hydrogen atom is -2.18 10^ -18 J. Its energy in the third Bohr orbit is...
- The pair of lanthanides in which both elements have high third-ionization energy is -
- 2-Methyl propyl bromide reacts with C_2H_5O^- and gives 'A' whereas on reaction with C_2H_5OH it gives 'B'. The mechanism...
- Which of the following statements are not correct ? A. The electron gain enthalpy of F is more negative than that of Cl. B....
- The radical which mainly causes ozone depletion in the presence of UV radiations is :
- Among the following compounds, the one which shows highest dipole moment is :
- The incorrect statement from the following for borazine is :
- A certain quantity of real gas occupies a volume of 0.15 dm^3 at 100 atm and 500 K when its compressibility factor is 1.07. Its...
- 25.0 mL of 0.050 M Ba(NO_3)_2 is mixed with 25.0 mL of 0.020 M NaF. K_ sp of BaF_2 is 0.5 10^ -6 at 298 K. The ratio of [Ba^ 2+...
- KMnO_4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H_2SO_4. Number of water molecules produces...
- t_ 87.5 is the time required for the reaction to undergo 87.5% completion and t_ 50 is the time required for the reaction to...